There's an interesting discussion going on over at the Chronicle of Higher Education (a good place to look for writing and editing jobs at colleges, BTW). A professor writes to the forum for a little sympathy on having had an article edited beyond recognition. The range of responses (from "thank her!" to something akin to "my editor sucked!") is fun to see.
This is an age-old problem. Most people don't like to be edited, especially if they feel the edits have changed their meaning or made them look bad. Their writing is supposed to speak for them; if it misrepresents them, it's a huge emotional issue. Even I have felt myself wincing when I've reviewed someone's edits to my writing (but I generally keep my mouth shut because I know all too well how it feels to have an author argue with me over edits).
On the other hand, I have encountered plenty of authors who are grateful for their editors. The good ones will thank you for making them look good.